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Discontinued Operations - Summary of Assets and Liabilities of Discontinued Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012
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Disposal Group Including Discontinued Operation Balance Sheet Disclosures [Abstract] |
Allowances for doubtful debts discontinued operations | $ 952

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Allowance for doubtful account of discontinued operations. + References No definition available. + Details
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Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant